Want more natural history and wildlife videos? Visit the official BBC Earth channel: http://bit.ly/BBCEarthWW BBC Earth The BBC Earth YouTube channel is home to over 50 years-worth of the best animal videos from the BBC archive. With three new videos released every week there’s something for all nature loves from astounding animal behaviour to beautiful imagery. Click here to find our more: http://bit.ly/BBCEarthWW On the marshes of Northern Argentina, Sir David Attenborough presents the birth of one of the largest snakes on the planet, the Anaconda. Brilliant wildlife video from Sir David Attenborough’s natural history masterpiece, Life in Cold Blood.